A centimeter-wave honey-cell CSRR sensor for non-invasive blood glucose level measurement

International audienceA frequent check of glucose level is necessary for diabeticsto control their glycaemia and thus avoid undesirable complicationssuch as kidney failure, lower limb amputation, stroke, heart attack.While most commercially-available devices are based on invasive orminimally invasive methods for glucose monitoring, other methodswere also developed using optical techniques. However, thesemethods are sensitive to physiological changes and are costly toimplement. In order to perform non-invasive and affordablemeasurements of blood glucose level for diabetics, a microstrip sensoroperating in the centimeter-wave band (2.3GHz) has been developed.The proposed sensor is based on an array of hexagonal-shapedcomplementary split ring resonators (CSRRs) in a honey-cellconfiguration. It was fabricated on a low cost FR4 substrate and firsttested in vitro with glucose aqueous solutions placed onto the sensor.To validate its detection capability for sensing glucose level variationsand tracking diabetes, a human fingertip model has been developed.This paper presents 3D full-wave electromagnetic field simulations ofthe sensor loaded by various fingers and primarily experimentalresults by studying pressure effect on the sen